<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>label标签</title>
</head>
<body>
    <label for="txt">用户名:</label>
    <input type="text" id="txt"/>
    <label for="man">男</label>
    <input type="radio" name="sex" id="man" />
     
</body>
</html>